Who has the best tennis serve?

Related questions

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2. What is the fastest female serve in tennis?
3. Who won Wimbledon 7 times?
4. Was battle of the sexes rigged?
5. How Fast Is Serena Williams serve?
6. Could Serena Williams beat a man?
7. Who won more Grand Slam titles?
8. Which tennis player has the most titles?
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10. Who was the youngest female to win Wimbledon?

Tags

1. #holds
2. #quarterfinals
3. #karlovi
4. #classic
5. #fastest
6. #washington
7. #serve
8. #tennis
9. #recorded
10. #second
11. #record
12. #however
13. #official
14. #mason
15. #isner